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Photo#1473327
Stem borer, Gentiana - Melanagromyza new-species-on-gentiana

Stem borer, Gentiana - Melanagromyza new-species-on-gentiana
Upper Iowa River Wildlife Management Area, Winneshiek County, Iowa, USA
November 29, 2017
In dead stem of a gentian, Gentiana sp., possibly G. andrewsii (bottle gentian)

I collected several of these puparia in gentian stems; most seemed to be in the upper half or upper third of the stems.

Placement in Melanagromyza is speculative, based on color of puparium and larval feeding habit

Rearing in progress

Ruler units are 32nds of an inch

Adult

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Stem borer, Gentiana - Melanagromyza new-species-on-gentiana Stem borer, Gentiana - Melanagromyza new-species-on-gentiana

Moved
Moved from Melanagromyza.

Williams (1999)
reports rearing a Melanagromyza sp. from overwintered bottle gentian stems. To my knowledge that is the first report of this species.

Williams, Andrew H. Fauna overwintering in or on stems of Wisconsin prairie forbs. In Springer, Joseph T. (ed.) / Proceedings of the Sixteenth North American Prairie Conference
(1999), pp. 156-161.